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      02-24-2011, 11:47 AM   #38
Clap135
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You and I def show the same understanding of how tuning should be applied. The difference that I have a low tolerance for ignorant spiteful members who know they are wrong but continue to post because they feel the need to justify their incorrect logic.
Quote:
Originally Posted by roninsoldier83 View Post
Fueling is closed loop on these cars compared to open loop on most other cars thanks to employing x2 WB02 sensors from the factory and having an ECU smart enough to address AFR quickly. However, there are still timing tables for these cars with base values that should be determined by load, just like any other modern turbo car (well, most NA cars as well).



Maybe there was a misunderstanding (we're on an open forum, it happens ), but I agree the base timing map (unless altered) is set by BMW from the factory. Sorry, I thought it was implied.

IMO, the knock sensor is meant to be a failsafe, and under the wrong circumstances it is a crucial tool in saving your motor. However, rather than relying on it as a means to altering timing, the base timing values should be set as a maximum, which should be under the knock threshold. Ultimately, the goal when tuning should be be set timing values (as well as AFR & boost of course) to a value that allows WOT operation without knock under most normal conditions.





^^^ Apparently you beat me to it

+1

While you and I see to have different styles of communication, on a technical level, we seem to have a similar mindset.



I've seen numerous OTS maps for multiple cars... I'm not a big fan, as they typically leave much to be desired. Hell, I'm not even a big fan of many supposedly conservative factory tunes (I've seen some pretty atrocious logs on stock cars of various makes over the years!! We're talking LTFT's around ~15%, AFR's deep into the 9:1 range under WOT, knock/timing correction all over, cars that won't hit peak targeted boost, you name it). Ultimately, these maps are made/tuned by someone else in another part of the country, and like humans, among cars there will always be variances. Manufacturers try to be overly conservative and make maps that will be safe in a variety of conditions, but there are so many variables from car to car that this is rarely optimum. I've seen cars with the same mods, running the same OTS maps, under the same conditions (elevation, fuel grade ect) make WOT pulls, and the logs/torque curves are vastly different.

Personally, I would rather tune my own car, for my own conditions (fuel grade, elevation, variances specific to my vehicle, ect, preferably under harsh conditions..) to ensure that my car is knock free while pushing peak boost/timing/under full load. I'm a big fan of optimum performance, consistency and safety when at all possible

That's just my $.02 though, YMMV.